remove dependence on libiberty for mingw in Makefile (not sure whether Cyrille will do this upstream)

moved cwiid and all disis libs except disis_munger to externals/disis, and removed linux-specific build instructions from tar_em_up.sh

begin porting the disis_* dirs to a single library in externals/, starting with disis_phasor~.c.  We're just using the most recent version of pdlibbuilder to do the heavy lifting.

fixed up dialog, backported some code from Pd-Vanilla 0.46